FKIE_CVE-2025-38560

Vulnerability from fkie_nvd - Published: 2025-08-19 17:15 - Updated: 2026-10-15 22:18
Severity
9.3 (Critical) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/sev: Evict cache lines during SNP memory validation An SNP cache coherency vulnerability requires a cache line eviction mitigation when validating memory after a page state change to private. The specific mitigation is to touch the first and last byte of each 4K page that is being validated. There is no need to perform the mitigation when performing a page state change to shared and rescinding validation. CPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit that, when set, indicates that the software mitigation for this vulnerability is not needed. Implement the mitigation and invoke it when validating memory (making it private) and the COHERENCY_SFW_NO bit is not set, indicating the SNP guest is vulnerable.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fb873971e23c35c53823c62809a474a92bc3022Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1fec416c03d0a64cc21aa04ce4aa14254b017e6aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b306dfa326f70114312b320d083b21fa9481e1ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a762a4c8d9e768b538b3cc60615361a8cf377de8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aed15fc08f15dbb15822b2a0b653f67e76aa0fdfPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f92af52e6dbd8d066d77beba451e0230482dc45bPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.17
debian debian_linux 11.0
To clipboard 

{
  "affected": [
    {
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          "product": "Linux",
          "programFiles": [
            "arch/x86/boot/cpuflags.c",
            "arch/x86/boot/startup/sev-shared.c",
            "arch/x86/coco/sev/core.c",
            "arch/x86/include/asm/cpufeatures.h",
            "arch/x86/include/asm/sev.h",
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            "arch/x86/boot/startup/sev-shared.c",
            "arch/x86/coco/sev/core.c",
            "arch/x86/include/asm/cpufeatures.h",
            "arch/x86/include/asm/sev.h",
            "arch/x86/kernel/cpu/scattered.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "6.16.1",
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              "status": "unaffected",
              "version": "6.17",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/sev: Evict cache lines during SNP memory validation\n\nAn SNP cache coherency vulnerability requires a cache line eviction\nmitigation when validating memory after a page state change to private.\nThe specific mitigation is to touch the first and last byte of each 4K\npage that is being validated. There is no need to perform the mitigation\nwhen performing a page state change to shared and rescinding validation.\n\nCPUID bit Fn8000001F_EBX[31] defines the COHERENCY_SFW_NO CPUID bit\nthat, when set, indicates that the software mitigation for this\nvulnerability is not needed.\n\nImplement the mitigation and invoke it when validating memory (making it\nprivate) and the COHERENCY_SFW_NO bit is not set, indicating the SNP\nguest is vulnerable."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/sev: Expulsar l\u00edneas de cach\u00e9 durante la validaci\u00f3n de memoria SNP Una vulnerabilidad de coherencia de cach\u00e9 SNP requiere una mitigaci\u00f3n de expulsi\u00f3n de l\u00ednea de cach\u00e9 al validar la memoria despu\u00e9s de un cambio de estado de p\u00e1gina a privado. La mitigaci\u00f3n espec\u00edfica es tocar el primer y el \u00faltimo byte de cada p\u00e1gina de 4K que se est\u00e1 validando. No es necesario realizar la mitigaci\u00f3n cuando se realiza un cambio de estado de p\u00e1gina a compartido y se rescinde la validaci\u00f3n. El bit CPUID Fn8000001F_EBX[31] define el bit COHERENCY_SFW_NO CPUID que, cuando se establece, indica que no se necesita la mitigaci\u00f3n de software para esta vulnerabilidad. Implemente la mitigaci\u00f3n e inv\u00f3quela al validar la memoria (haci\u00e9ndola privada) y el bit COHERENCY_SFW_NO no est\u00e1 establecido, lo que indica que el invitado SNP es vulnerable."
    }
  ],
  "id": "CVE-2025-38560",
  "lastModified": "2026-10-15T22:18:45.443",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
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        "type": "Secondary"
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "source": "nvd@nist.gov",
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        "ssvcData": {
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          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
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          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T21:51:41.610639Z",
          "version": "2.0.3"
        }
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  },
  "published": "2025-08-19T17:15:32.370",
  "references": [
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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